cl1 = 0.25;
cl2 = 0.10;
Point(1) = {0, 0, 0, cl1};
Point(2) = {10, 0, 0, cl1};
Point(3) = {10, 2, 0, cl1};
Point(4) = {0, 2, 0, cl1};
Point(5) = {1, 1, 0, cl1};
Point(6) = {1, 0.5, 0, cl2};
Point(7) = {1, 1.5, 0, cl2};
Point(8) = {0.5, 1, 0, cl2};
Point(9) = {1.5, 1, 0, cl2};
Point(10) = {9, 1, 0, cl2};
Point(11) = {9, 0.5, 0, cl2};
Point(12) = {9, 1.5, 0, cl2};
Point(13) = {9.5, 1, 0, cl2};
Point(14) = {8.5, 1, 0, cl2};
Line(1) = {1, 2};
Line(2) = {2, 3};
Line(3) = {3, 4};
Line(4) = {4, 1};
Circle(5) = {6, 5, 9};
Circle(6) = {9, 5, 7};
Circle(7) = {7, 5, 8};
Circle(8) = {8, 5, 6};
Circle(9) = {11, 10, 13};
Circle(10) = {13, 10, 12};
Circle(11) = {12, 10, 14};
Circle(12) = {14, 10, 11};
Line Loop(16) = {3, 4, 1, 2, -5, -8, -7, -6, -10, -9, -12, -11};
Plane Surface(16) = {16};
